Once you are in heaven the sexual behavior stops so you are not a homosexual.
Where does it say that? I hope I get to have more time with my husband in heaven.
How do we KNOW that?
In marriage sex is a sacred act. (see the sanctity of the marital bed) Therefore since heaven is for the sacred, and certain sex is sacred, there should be sex in heaven.
Of course it is just a matter of getting there and seeing for ourselves...